BE539848A - - Google Patents
Info
- Publication number
- BE539848A BE539848A BE539848DA BE539848A BE 539848 A BE539848 A BE 539848A BE 539848D A BE539848D A BE 539848DA BE 539848 A BE539848 A BE 539848A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US443792A US2801287A (en) | 1954-07-16 | 1954-07-16 | Control of regular and distant talking subscribers sets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE539848A true BE539848A (da) |
Family
ID=23762223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE539848D BE539848A (da) | 1954-07-16 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2801287A (da) |
| JP (1) | JPS331003B1 (da) |
| BE (1) | BE539848A (da) |
| DE (1) | DE1032791B (da) |
| FR (1) | FR1122352A (da) |
| GB (1) | GB777184A (da) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2895007A (en) * | 1955-11-03 | 1959-07-14 | Ericsson Telefon Ab L M | Telephone installation |
| US2877302A (en) * | 1956-04-23 | 1959-03-10 | Gai Tronics Corp | Telephone equipment |
| BE560891A (da) * | 1956-10-05 | |||
| BE560927A (da) * | 1956-10-08 | |||
| BE563970A (da) * | 1957-01-15 | |||
| US3011024A (en) * | 1958-07-25 | 1961-11-28 | Kastel Lillian | Telephone set |
| USRE25507E (en) * | 1959-12-16 | 1964-01-07 | Frequency - cps | |
| DE1141681B (de) * | 1961-04-07 | 1962-12-27 | Huettenwerk Oberhausen Ag | Fernsprechteilnehmerschaltung fuer Linien-Waehlanlagen mit Freisprecheinrichtung |
| US3530250A (en) * | 1965-06-19 | 1970-09-22 | Agfa Gevaert Ag | Telephone monitoring of remotely located areas |
| SE339833B (da) * | 1970-02-18 | 1971-10-25 | K Blomberg | |
| GB8334012D0 (en) * | 1983-12-21 | 1984-02-01 | Gen Electric Co Plc | Telephone instruments |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB336946A (en) * | 1928-10-10 | 1930-10-21 | Siemens Ag | Improvements in circuit arrangements for conference telephones |
| DE597131C (de) * | 1930-09-05 | 1934-05-17 | Siemens & Halske Akt Ges | Schaltungsanordnung fuer Konferenzanlagen mit mehreren Haupt- und Nebenstellen |
| CH192713A (de) * | 1936-11-05 | 1937-08-31 | Autophon Ag | Umschalteinrichtung zur wahlweisen Führung der Gespräche mit dem Mikrotelephon des Sprechstellen-Apparates oder mit einem Lautsprechertelephon. |
| US2300044A (en) * | 1940-07-23 | 1942-10-27 | American Telephone & Telegraph | Telephone subscriber's station |
| BE468046A (da) * | 1942-10-24 | |||
| CH240686A (de) * | 1942-11-16 | 1946-01-15 | Ag Autophon | Vermittlungseinrichtung in elektro-akustischer Übertragungsanlage. |
| DE887956C (de) * | 1950-12-27 | 1953-08-27 | Western Electric Co | Schaltungsanordnung zur Regelung des UEbertragungspegels fuer Fernsprechteilnehmerstellen |
-
0
- BE BE539848D patent/BE539848A/xx unknown
-
1954
- 1954-07-16 US US443792A patent/US2801287A/en not_active Expired - Lifetime
-
1955
- 1955-02-21 FR FR1122352D patent/FR1122352A/fr not_active Expired
- 1955-05-11 JP JP1309955A patent/JPS331003B1/ja active Pending
- 1955-05-25 DE DEW16759A patent/DE1032791B/de active Pending
- 1955-07-01 GB GB19085/55A patent/GB777184A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB777184A (en) | 1957-06-19 |
| JPS331003B1 (da) | 1958-02-18 |
| US2801287A (en) | 1957-07-30 |
| DE1032791B (de) | 1958-06-26 |
| FR1122352A (fr) | 1956-09-05 |